citizen. noun citÂ·iÂ·zen \Ësi-tÉ-zÉn also-sÉn\. Tweet. : a person who legally belongs to a country and has the rights and protection of that country. : a person who lives in a particular place.itizen is preferred for one owing allegiance to a state in which sovereign power is retained by the people and sharing in the political rights of those people. subject implies allegiance to a personal sovereign such as a monarch.
Primary biliary cirrhosis, also known as primary biliary cholangitis (PBC), is an autoimmune disease of the liver. It is marked by slow progressive destruction of the small bile ducts of the liver, with the intralobular ducts and the Canals of Hering (intrahepatic ductules) affected early in the disease.
PKU is treated with a special low-protein diet, which reduces the levels of phenylalanine in the body and prevents brain damage. PKU doesn't usually cause any symptoms if treatment is started early. If PKU isn't treated, damage to the brain and nervous system can lead to: 1  learning disabilities. 2  behavioural difficulties.